Herbicidal compositions comprising dimethenamid and a pyridazinone herbicide

Abstract

Co-application of dimethenamid with pyridazinone herbicides such as norflurazon provides improved herbicidal activity.

What is claimed is: 
     
       1. A herbicidal composition comprising a herbicidally effective amount of dimethenamid, a pyridazinone herbicide, and an agriculturally acceptable carrier. 
     
     
       2. The composition of claim 1 wherein the amount of dimethenamid is such that it can be applied at a rate from 0.1 to 3.0 kg/ha. 
     
     
       3. The composition of claim 1 wherein the amount of dimethenamid is such that it can be applied at a rate from 0.25 to 1.5 kg/ha. 
     
     
       4. The composition of claim 1 wherein the amount of the pyridazinone herbicide is such that it can be applied at a rate from 0.1 to 3.0 kg/ha. 
     
     
       5. A method of controlling undesired plant growth in the presence of a crop comprising applying postemergence to the locus of said undesired plant growth, a herbicidally effective aggregate amount of dimethenamid and a pyridazinone herbicide wherein the application rate of dimethenamid is from 0.1 to 3.0 kg/ha. 
     
     
       6. The method of claim 5 wherein the application rate of the pyridazinone herbicide is from 0.1 to 3.0 kg/ha. 
     
     
       7. The method of claim 5, wherein the application rate of dimethenamid is from 0.25 to 1.5 kg/ha. 
     
     
       8. The method of claim 5 wherein the crop is maize. 
     
     
       9. The method of claim 5 wherein the undesired plant growth to be controlled is a grassy weed. 
     
     
       10. The method of claim 5 wherein the undesired plant growth to be controlled is a broadleaf weed. 
     
     
       11. The method of claim 5 wherein said applying step comprises co-applying dimethenamid and the pyridazinone herbicide in a tank mix. 
     
     
       12. The method of claim 5 wherein said applying step comprises applying the herbicides simultaneously to the locus of said undesired plant growth. 
     
     
       13. The method of claim 5 wherein said applying step comprises applying the herbicides sequentially to the locus of said undesired plant growth. 
     
     
       14. A method of controlling undesired plant growth in the presence of a maize crop comprising applying postemergence to the locus of said undesired plant growth a herbicidally effective aggregate amount of dimethenamid and a pyridazinone herbicide wherein the dimethenamid and pyridazinone herbicide are applied either simultaneously or in sequential application.